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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36c6b1c86307aac9ac534e44cc5ecdc4a08630bfdcec5b4d3a56a9876598b94' 
  AND token = 'Yuuk81CAfR7wnOhC/KblJ6CACZ1rVlQ7CL/8RTADPR4=' 
  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"
    }
  }
}