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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af0dddaa4e1027c0b22d32c96277b39a013ee97381ebf3ed9d5bc466c1fa3a9e' 
  AND token = 'Rju8Lv15UqkxImtA3Uv6MsNrPXeFMUCXSJq16mn/Vg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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