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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e471efa5c4d327e8a84c52341b2948f1b8f58bd91fbec5c66b209a8f41eff0cd' 
  AND token = '0FcqHIrPB+QjBirm24ZbaNoFUvHe8wnTc/tVnM1Hbvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}