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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad67ae1adbdc7e34dc71d967f5fbe807111c4950c9e12bd46052acdeae3df28e' 
  AND token = 'j/xyFEg65svbhq0I01zR2dWm+fJX/R1oNnctgUEWpLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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