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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9817a1780009e02b00b7fd0d48c54b6f8bb2cad4591f1be04be03521858d2fa5' 
  AND token = 'q+z/JLwAC6RI884CnirXjfL3H/lkABNfIrEhUZwd5o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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