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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b64a02c09a7ee52e46bc1e19bacc69218a0d46a0e36f773749943b44068518' 
  AND token = 'GyTWVmsVdDXR29nNOZpBwW0bn6Ea4otPWslaqcG6sAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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