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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff984fbe034275d209e1db00408d874fd57c5e5f4b6c216fe12e18f663ce342' 
  AND token = '+tIkLU46LimcAvWyMY2l/W+wpAe9NE9+AFk5BL/QWYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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