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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84049e39cfa3d001a1f053b812ddaa3a4529997896aa22e2864ca8494c5e4550' 
  AND token = 'AVcUg5f8kzC7V78/q2vQzeSYbhC0Gt9PfOpcosayQ0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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