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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da3fd930b8ea17c852e20c585a0373a3373839e244ff5f81b170fd98e378d11' 
  AND token = '2fpsWez7U5YsqA/SlyJtMTcpNhmixGXEeZHPpbyVHN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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