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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c004175d84564e8d47047a388f51763ecf98b8fc32b2ddedf1aa1948a27464' 
  AND token = '01Wa7oJRyF/nRWykOgewp6KPtrnb/Lg+EayRgZauotI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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