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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37aa87b523cfa67443b14960e02a2b7a4ef4c6a5b464cb51dfa7c8870510dd21' 
  AND token = 'LxF65Ua7GzZMldwosOEjb4JRq8VS1ejyBafvPuPwAR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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