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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d50c374c5e7a35ae88e1ca5299d9b2310553e9a71dbefc83ef73254811822d' 
  AND token = 'jlZzEsr+6sNSj5ZiWzTrgZae1eDSfLYbyOe4K1jPZ6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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