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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9dd4aa6478b6629f4e46598dcd60c785cd23f00602c03cc7712138ca7b27a6' 
  AND token = '/+gjPShYMk+na+XPUjeTscyTIwomEOfNbtGeKVj8Vig=' 
  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"
    }
  }
}