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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4a828629133b7df4497644b61998c4cccdd41693ce710d80700a67748d9934' 
  AND token = 'GXpLmmJmJ6H6iFyxjtTtseNFHX8YQ3ILG8BS/eN/+HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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