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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b823a290c0d3dd428a50e16afae4454e07e17415c78110dce4625d0a662c310' 
  AND token = '3GhzOLmbCKfhM2tCn3l+gSZGQ6lWo4knEogChA7ZQn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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