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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3d9be539c4db1fa279670f219c629d1882eac120dedbf4bebcd2d87dbafee2' 
  AND token = '2PY5cxqZQj9vUfFjfUriiSOpY/eYeK1A2+tWU6G13CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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