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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb12fb28de93ebf380b1489b13b2378953c2c196fe9d68e70884b7fd87074e7' 
  AND token = 'Mb9D55rV1j+nYy5MFzwRrjSPRyE7dT2uHoA20INBijA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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