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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79974f9b85806064b1374b605f60eea1f5a180bce4c7aa1cbbdf9bc1ac383f53' 
  AND token = 'iTnC54N/IN6kmEkuK5/hAKYZom9cTFO7FyKhwQ5Ag/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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