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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0129627d0b03d5680fa60c2486f47f14eb16d522795bfa082486b5e247dcb975' 
  AND token = 'o6EV/vevtRce75JsG564frzkFreHb9W0huI682TYO3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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