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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ed4ef3ca3d66db50d1d4e7bbc3a28bded238221b798c342b1859c01d2e1dc2' 
  AND token = '+nXVTsIFbUsxNebtn3oqylcQK0nV+bOrAukWO3vv0Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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