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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a9fb6d1c0467a86c23fc21a25405da63109aba8b0383daedad18f20872628d' 
  AND token = '44a5Us9L68FtJLjSb0orSfgjJPzFve6RCdaU6BwH1/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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