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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7939780282d50d8e97f6f92d5e05f146c9ad7416344e6f9343edc6b08fc0aff2' 
  AND token = 'CNXaN6iJdYTFVwaL9NHDQRQevykaQJHYQGZ3hyYvA5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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