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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3d0a39be88134d66d627d30761d55a978ab4e293b569098794af23b702c8db' 
  AND token = '+Pit+2xwdXlMeRTCIM/nlJqfjKsad8lKwTssH75UrxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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