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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918b6acb76026b0d8c3662db0b61a0e672ab77001815db737ae3aff2307bf513' 
  AND token = 'V5/gwnqObmkVy1ZH1h8C7uZ1i82+8i3f4ScU76es3cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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