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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a6745a1fe1ed4fed9a671eb6e3e5919f9c1657aa36f4fdde43b81ec34af5393' 
  AND token = '7F+UTYELgdUNiA82mj3HnvvMJU7DbqmO5QrKRORmPks=' 
  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"
    }
  }
}