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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c686ef68c7216f524dd66124775d4ae8b9023c1b2549e5a352b1c741d7af1a' 
  AND token = '9haeVTidyUXIxa41eApHspEFQZO6x6GDed7poqeK94Q=' 
  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"
    }
  }
}