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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f16a6a1708af139f18078844ba965ca9c392c77b8a6e54f4728cc3426f0af0c' 
  AND token = 'XF+qpZhuMmX47PRqgaodaAk+hSXeem8pTC7Ssf5h01E=' 
  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"
    }
  }
}