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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe3d0655ecf650990acb08891b5cebe796d5babc58abf96be1d5d4d37203adf' 
  AND token = 'JBEbboK42aO2oN/pHr4QA0LMHljYL3XMHNU3HYWJHO8=' 
  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"
    }
  }
}