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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5d4b5b9e67f98bc5c7be985a0f9691145ff60e7e9554bd5441efb5fd3237d0' 
  AND token = 'AIBBAucvx+2juf5/VY8MHQ6B7rGPuq4GxCd+9UtCkAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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