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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ed06a5f10e010bb601c4ddc1963f0ee32aebcc064c8c638be5f081e566a9f2' 
  AND token = 'BLI95Mfx3kdpCAE47aKFuWJA/lpl7JyrvFXS2Zk+6Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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