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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51708b0b31c47ed232bf4bc28cef5740a32c2f79bbf6c2cc9ebc271dcbeb7359' 
  AND token = 'VoIKWdY+6DYYwdTR2WyWO2SUgBg4bmxIpTQqbAz8ZR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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