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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0003acc1f68e40a5be516e006300d3427b70bfaec435b5a7de99c994877d59' 
  AND token = 'gVHvkMVazWPwZLqbuJ7Zu5vb9ea+XN98FRfNV3PrvMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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