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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67adcaffad57ac429ae3216bc2adcb8ac746a392ea263901fc857bd613200d6' 
  AND token = 'cRf2wRYg4eAOvpo849qhAnaLVY8lS6fVg0D+vqs7vw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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