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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2897bad8cf3f090f36ca5dd94f4153b8901ab4d273b35e3a7537a1883c6df738' 
  AND token = 'gyPs6W3RWDSUEct6ErT23l6VPH8jv8Gv5myAo8JlNFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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