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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f92c5675213f2cd62a6bade30e6e1805946e9974d7cc709b6b27cb06bf1efe' 
  AND token = 'hz3X6lVr942h1d1Hgmi8WJFtb76BVWMSLdxbs3lxqC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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