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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9983a4f27a1fc175624b9fbc4bd242e803e1e7017ae2cd9c080affd2e2beaed8' 
  AND token = 'qvpvu1eEmc1I80MUZNHcSTgRxqIrX6aWul3BL3LH08A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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