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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24474d1551d3d745dc28b5d15658bdb92ee4d92ed7d653a79ef4e5f9a3277ebd' 
  AND token = 'w3eDeENi6C0j1s3M9LzhL3PMrJaOg5yxzc8JZ+wkGvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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