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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18b3cedf1a99bed52394e12b59c12969f5ff3391a62d4b050ff1e85c6b3894c' 
  AND token = 'e6DhGXVcwTRkFkKxw11KcSR5HXGF6pMJbmSkpFKcbtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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