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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b8e24ec1ba781b59288325b2b279919371a34aacc6315203311fe35d8d6315' 
  AND token = '7KXYREPCnj8N5hEgnTdqQz9s8u/zqM+b/8I4N3S50wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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