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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177095f3b790c7a4de4d5c9fad4e3639b77508a33ed4dd744323a7c6425c3898' 
  AND token = '51OJRX/KQ0zsz6ggoJkcBjkWQE8D+hikcj/IHMzg650=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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