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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a59f545da057a22ef5e8380235ce8cb7b47e2ffbe851e29f73d6bb8496634ba' 
  AND token = 'BCk8qt/XdLzWvv0b8fffv7zQmItOsYYBy7mNppSekcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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