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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '400032bf78abb2283533d2cbfb281b76bcf9b327c7d20cee4c6b06d163cf175f' 
  AND token = '12NGDbdlcyPtqvvhoTAuli2ldqWn1gEAr5DXRTjk+Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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