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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57e38ef98dbb025507a423a1d90c9f0bf79d56f27ab2b38f59184107c5543527' 
  AND token = '7gSa4uuSvKK0acYdyWCwMD48EtfFpPwNpfCDKMiAUec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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