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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9524d1654ca6399e89ffac586d7ff7ff6e96575c72fff9f1e6a5538f18551fe' 
  AND token = 'Rl1jFFv9f67yZohf+tcMiEySAvp1d5xk1Y1aZ+vHwg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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