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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a135f616b405571d32c75f2c0dfe2fdbba845806c76f9b2b0d879a088ce7bc80' 
  AND token = 'utYL+zg/RJ1rAo0kzFY2fkhftIJy6a0yd3F0452V87c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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