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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c058036e71dc0b0243c522af998e52b3a7a4f3e3f38e73a1b9a2a661b57ceb27' 
  AND token = 'KQGUpX6IWwPKQ+rH6EI3VJdChiPHZ/eZn1D3g0QkO0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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