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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ef46ea1a4244f09323abece3eed86d3b986349ee1fb7c5613ac3f5a2505ccc' 
  AND token = 'XBEmE5z7iQBRBVWMKM2sFcy/J1PAer1u83OJZE9vqFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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