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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11efed4b1dfe7a54e6e39a7c4b1563e5ea4dd8d0a6e3e9cdcec89427671cf333' 
  AND token = 'A6sX5pfL4Xh05hpvVT9zBVE4lPXO7mXhiNtWdM2fB3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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