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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c53336b9ddfb87429f98e9170b2e45862feb6ba6579b4e4a0e48adee90c9597' 
  AND token = 'BxHJZ4LgQEYblB77PqXmUt+es9ErNNGBNN7aZEX5ejQ=' 
  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"
    }
  }
}