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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fbbace6d2f5ee5771da1ef079a56dc73e44c6156a12e193befb0652712b8aa9' 
  AND token = 'Z4/UmISbcO6yo0Cc445yqmv08wbo5uN9CRdNoZu2e48=' 
  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"
    }
  }
}